166685206540 has 48 divisors (see below), whose sum is σ = 352635816960. Its totient is φ = 66180139200.

The previous prime is 166685206511. The next prime is 166685206553. The reversal of 166685206540 is 45602586661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3913881 + ... + 3956239.

It is an arithmetic number, because the mean of its divisors is an integer number (7346579520).

Almost surely, 2^166685206540 is an apocalyptic number.

166685206540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166685206540 is an abundant number, since it is smaller than the sum of its proper divisors (185950610420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166685206540 is a wasteful number, since it uses less digits than its factorization.

166685206540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43822 (or 43820 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 166685206540 in words is "one hundred sixty-six billion, six hundred eighty-five million, two hundred six thousand, five hundred forty".